161606010566065 has 16 divisors (see below), whose sum is σ = 208890062394048. Its totient is φ = 119313896435136.

The previous prime is 161606010566059. The next prime is 161606010566069. The reversal of 161606010566065 is 560665010606161.

It is not a de Polignac number, because 161606010566065 - 2²⁷ = 161605876348337 is a prime.

It is a super-2 number, since 2×161606010566065² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161606010566069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269768839 + ... + 270367228.

It is an arithmetic number, because the mean of its divisors is an integer number (13055628899628).

Almost surely, 2^{161606010566065} is an apocalyptic number.

It is an amenable number.

161606010566065 is a deficient number, since it is larger than the sum of its proper divisors (47284051827983).

161606010566065 is a wasteful number, since it uses less digits than its factorization.

161606010566065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540140688.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 161606010566065 in words is "one hundred sixty-one trillion, six hundred six billion, ten million, five hundred sixty-six thousand, sixty-five".